Add SDK payroll dry-run executor

[edehvictor]

Summary

Provide a dry-run executor that validates payroll actions without submitting transactions.

Why This Matters

Dry runs help teams catch configuration, proof, treasury, and payload issues before signing.

Suggested Files

• src/payroll/**
• src/dry-run/**
• src/transactions/**
• tests/**

Tasks

• Define dry-run result types and warnings.
• Validate payloads, config, network, proof readiness, and treasury assumptions.
• Add tests for successful, warning, and failed dry-run results.

Acceptance Criteria

• SDK consumers can run payroll validation without submitting a transaction.
• Dry-run failures are clear and typed.
• Dry-run output avoids leaking private payroll values.

Coordination

Join the Telegram channel for proper coordination: https://t.me/zkpayroll

[Purity-Euphemia]

Good Day Maintainer, I have experience and would review the issue, implement a clean solution, test it, and submit a pull request.